2 * linux/drivers/mmc/core/sdio_bus.c
4 * Copyright 2007 Pierre Ossman
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
11 * SDIO function driver model
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/export.h>
17 #include <linux/slab.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/pm_domain.h>
20 #include <linux/acpi.h>
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
24 #include <linux/mmc/sdio_func.h>
31 #ifdef CONFIG_MMC_EMBEDDED_SDIO
32 #include <linux/mmc/host.h>
35 #define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
37 /* show configuration fields */
38 #define sdio_config_attr(field, format_string) \
40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
42 struct sdio_func *func; \
44 func = dev_to_sdio_func (dev); \
45 return sprintf (buf, format_string, func->field); \
47 static DEVICE_ATTR_RO(field)
49 sdio_config_attr(class, "0x%02x\n");
50 sdio_config_attr(vendor, "0x%04x\n");
51 sdio_config_attr(device, "0x%04x\n");
53 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
55 struct sdio_func *func = dev_to_sdio_func (dev);
57 return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
58 func->class, func->vendor, func->device);
60 static DEVICE_ATTR_RO(modalias);
62 static struct attribute *sdio_dev_attrs[] = {
64 &dev_attr_vendor.attr,
65 &dev_attr_device.attr,
66 &dev_attr_modalias.attr,
69 ATTRIBUTE_GROUPS(sdio_dev);
71 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
72 const struct sdio_device_id *id)
74 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
76 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
78 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
83 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
84 struct sdio_driver *sdrv)
86 const struct sdio_device_id *ids;
91 while (ids->class || ids->vendor || ids->device) {
92 if (sdio_match_one(func, ids))
101 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
103 struct sdio_func *func = dev_to_sdio_func(dev);
104 struct sdio_driver *sdrv = to_sdio_driver(drv);
106 if (sdio_match_device(func, sdrv))
113 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
115 struct sdio_func *func = dev_to_sdio_func(dev);
117 if (add_uevent_var(env,
118 "SDIO_CLASS=%02X", func->class))
121 if (add_uevent_var(env,
122 "SDIO_ID=%04X:%04X", func->vendor, func->device))
125 if (add_uevent_var(env,
126 "MODALIAS=sdio:c%02Xv%04Xd%04X",
127 func->class, func->vendor, func->device))
133 static int sdio_bus_probe(struct device *dev)
135 struct sdio_driver *drv = to_sdio_driver(dev->driver);
136 struct sdio_func *func = dev_to_sdio_func(dev);
137 const struct sdio_device_id *id;
140 id = sdio_match_device(func, drv);
144 ret = dev_pm_domain_attach(dev, false);
145 if (ret == -EPROBE_DEFER)
148 /* Unbound SDIO functions are always suspended.
149 * During probe, the function is set active and the usage count
150 * is incremented. If the driver supports runtime PM,
151 * it should call pm_runtime_put_noidle() in its probe routine and
152 * pm_runtime_get_noresume() in its remove routine.
154 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
155 ret = pm_runtime_get_sync(dev);
157 goto disable_runtimepm;
160 /* Set the default block size so the driver is sure it's something
162 sdio_claim_host(func);
163 ret = sdio_set_block_size(func, 0);
164 sdio_release_host(func);
166 goto disable_runtimepm;
168 ret = drv->probe(func, id);
170 goto disable_runtimepm;
175 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
176 pm_runtime_put_noidle(dev);
177 dev_pm_domain_detach(dev, false);
181 static int sdio_bus_remove(struct device *dev)
183 struct sdio_driver *drv = to_sdio_driver(dev->driver);
184 struct sdio_func *func = dev_to_sdio_func(dev);
187 /* Make sure card is powered before invoking ->remove() */
188 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
189 pm_runtime_get_sync(dev);
193 if (func->irq_handler) {
194 pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
196 sdio_claim_host(func);
197 sdio_release_irq(func);
198 sdio_release_host(func);
201 /* First, undo the increment made directly above */
202 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
203 pm_runtime_put_noidle(dev);
205 /* Then undo the runtime PM settings in sdio_bus_probe() */
206 if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
207 pm_runtime_put_sync(dev);
209 dev_pm_domain_detach(dev, false);
214 static const struct dev_pm_ops sdio_bus_pm_ops = {
215 SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
217 pm_generic_runtime_suspend,
218 pm_generic_runtime_resume,
223 static struct bus_type sdio_bus_type = {
225 .dev_groups = sdio_dev_groups,
226 .match = sdio_bus_match,
227 .uevent = sdio_bus_uevent,
228 .probe = sdio_bus_probe,
229 .remove = sdio_bus_remove,
230 .pm = &sdio_bus_pm_ops,
233 int sdio_register_bus(void)
235 return bus_register(&sdio_bus_type);
238 void sdio_unregister_bus(void)
240 bus_unregister(&sdio_bus_type);
244 * sdio_register_driver - register a function driver
245 * @drv: SDIO function driver
247 int sdio_register_driver(struct sdio_driver *drv)
249 drv->drv.name = drv->name;
250 drv->drv.bus = &sdio_bus_type;
251 return driver_register(&drv->drv);
253 EXPORT_SYMBOL_GPL(sdio_register_driver);
256 * sdio_unregister_driver - unregister a function driver
257 * @drv: SDIO function driver
259 void sdio_unregister_driver(struct sdio_driver *drv)
261 drv->drv.bus = &sdio_bus_type;
262 driver_unregister(&drv->drv);
264 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
266 static void sdio_release_func(struct device *dev)
268 struct sdio_func *func = dev_to_sdio_func(dev);
270 #ifdef CONFIG_MMC_EMBEDDED_SDIO
272 * If this device is embedded then we never allocated
273 * cis tables for this func
275 if (!func->card->host->embedded_sdio_data.funcs)
277 sdio_free_func_cis(func);
285 * Allocate and initialise a new SDIO function structure.
287 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
289 struct sdio_func *func;
291 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
293 return ERR_PTR(-ENOMEM);
297 device_initialize(&func->dev);
299 func->dev.parent = &card->dev;
300 func->dev.bus = &sdio_bus_type;
301 func->dev.release = sdio_release_func;
307 static void sdio_acpi_set_handle(struct sdio_func *func)
309 struct mmc_host *host = func->card->host;
310 u64 addr = ((u64)host->slotno << 16) | func->num;
312 acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
315 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
318 static void sdio_set_of_node(struct sdio_func *func)
320 struct mmc_host *host = func->card->host;
322 func->dev.of_node = mmc_of_find_child_device(host, func->num);
326 * Register a new SDIO function with the driver model.
328 int sdio_add_func(struct sdio_func *func)
332 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
334 sdio_set_of_node(func);
335 sdio_acpi_set_handle(func);
336 ret = device_add(&func->dev);
338 sdio_func_set_present(func);
344 * Unregister a SDIO function with the driver model, and
345 * (eventually) free it.
346 * This function can be called through error paths where sdio_add_func() was
347 * never executed (because a failure occurred at an earlier point).
349 void sdio_remove_func(struct sdio_func *func)
351 if (!sdio_func_present(func))
354 device_del(&func->dev);
355 of_node_put(func->dev.of_node);
356 put_device(&func->dev);